1)
8cm
3cm

10cm
7cm
5cm
Perimeter =
cm what is the perimeter

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

What is the absolute value of the complex number -4-sqrt2i

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.